The magnetic moment of a current I carry

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Target Exam

CUET

Subject

Physics

Chapter

Moving Charges and Magnetism

Question:

The magnetic moment of a current I carrying a circular coil of radius r and number of turns N varies as which of the following?

Options:

r⁴

r²

r^-2

r³

Correct Answer:

r²

Explanation:

Magnetic moment : μ = I A

I : Current

A : Area

As A ∝ r², Therefore, μ ∝ r²